Headboard



FIG. 1 is a perspective view of a headboard, showing our new design;

FIG. 2 is a front elevation view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a right side elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict portions of the headboard that form no part of the claimed design. 

CLAIM The ornamental design for a headboard, as shown and described. 